Looper mechanism for sewing-machines.



D. S. SEYMOUR.

LOOPER MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR. 10, l9l6.

5 Patented Feb. 26, 1918.

' a SHEETSSHEET 1.

0. s. SEYMOUR.

LOOPER MECHANISM FOR SEWING MACHiNES.

APPLICATION FILED MAR. 10. 1916.

LQWKMU. Patented Feb. 26,1918.

3 SHEETS-SHEET 2.

D. S. SEYMOUR.

LOOPER MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR- 10. I916.

Patented Feb. 26, 1918 3 SHEETS-SHEET 3.

DUDLEY S. SEOIIR, F OAK PARK,

ILLINOIS, ASSIGNOR '10 UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LCOPEB ECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented net, as, T1

Application filed March 10, 1916. Serial N '0. 83,297.

To all whom it may concern:

Be it known that T, DUDLEY S. SEYMOUR I a citizen of the United States, residing at Oak Park, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Looper Mechanism for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing, and to the figures of reference marked thereon.

My invention relates to new and useful improvements in sewing machines, and more particularly to the looper mechanism for a sewing machine wherein the material being stitched is supported by a work-supportin arm extendingat an angle to the plane 0 the overhanging arm of the machine.

An, object of the invention is to provide a supporting shaft and for moving the same endwlso.

' These and other objects, will in partbe obvious, and will in part be hereinafter more fully disclosed.

In the drawings, which show by way of.

illustrationone embodiment of the inven- Figure 1 is a view partly in side elevation and partly in section, showing a machine embodying my improvements;

Fig. 2 is a view part1 I in front elevatlon and partly in section 0 the same;

a Fig. 3 is an enlarged detail view length wise. of the work-supporting arm, showing- Projecting laterally fromv the standard is an overhanging arm 3. Mounted in the overhanging arm is a shaft 4. At the forward end of the overhanging arm is a needle bar 5, which is reciprocated from said shaft 4. The shaft 4 is oscillated by mechanism which will be hereinafter described and on the forward end of the shaft there is an arm 6 connected by a link 7 to a suitable luion a collar fixed to the needle bar.

s the shaft 4 is oscillated, the needle bar will be reciprocated. Said needle bar as herein shown is provided with two pairs of needles 8, 8 and 9, 9.

The standard 1 is also provided with a forwardly projecting arm 10. Extending laterally from this forwardly projectin arm is a horizontal arm 11. The horizonta arm is substantially parallel with the overhanging arm 3. At the free end of the horizontal arm there is a depending post 12, which carries the work-supporting arm proper 13. The work-supporting arm 13 extends in a direction at an angle to a vertical plane containing the longitudinal axisv of the overhanging arm, that is, the plane ',of the overhangmg arm, and the free end of this work-supporting arm is located underneath the free end of the overhanging.

arm. 1

Mounted in the-horizontal arm 11 is a main shaft 14. This main shaft extends through the forwardly projecting arm and is provided with a belt wneel 15. The forwardly projecting arm is provided with suitable main shaft is mounted, and between these bearings said main shaft is formed with a crank 18. A pitman 19 cooperating with the crank is also connected to an arm 20 fixed to the shaft 4, and this pitman oscillates the shaft 4..

Cooperating, with the needles 8, S is a looper 21 while a looper 22 cooperates with the pair of needles 9. These loopers 21 and 22 are monnted on the looper car'rier 23, fixed to the forward end of a loopersupporting shaft24. The pairs of needles are arranged one in rear of the other, so

the separate loopers may coiiperate with the res ective pairs of needles. The looper shaft 24 15 mounted in a bearing 25near the forward end of the work-supportin arm 13, and a bearing 26 at the front side of the bearings 16 and 17 in which thedependin post 12. The shaft is mounted in these iearings so that it oscillates and moves endwise in the bearings.

The main shaft 14 is provided with an eccentric with \vhichan eccentric strap 27 coiiperates. This eccentric strap at the lower end is connected to a ball stud 28 on the outer end of an arm 29 fixed to a cross shaft 30. The cross shaft 30 is provided with a second arm 31. The looper-supporting shaft 24 carries a collar 32, which is fixed thereto, and said collar has an outwardly extending arm 33. A link 34 connects the arms 31 and 33. There is a ball stud mounted on each arm 31 and 33, so that the looper support and the arm 33 may be moved in a direction longitudinally of the looper shaft without interfering with the. driving connections between the cross shaft and the looper shaft.

From the above it will be apparent that as themain shaft 14 rotates, the cross shaft will be oscillated, and through the arms 31 and 33 and the connecting link the loopersupporting shaft will be oscillated, so as to move the loopers into and out of the needle loops.

Mounted on the looper-supporting shaft is a sleeve 34. Said sleeveis held from endwise movement on the shaft by fixed collars 35 and 36. This permits the looper-supporting shaft to oscillate freely relative to the sleeve, but all endwise movements of the sleeve will be imparted to the looper-supporting shaft. The sleeve 34 is provided with a rib 37, which extends between suitable guiding lugs 38 carried by the worksupporting arm 13. This prevents the sleeve from oscillating.

The sleeve is moved endwise for imparting endwise movement to the. looper-supporting shaft by a cross shaft 39. Said cross shaft is mounted in suitable hearings in the worksupporting arm 13. The cross shaft has a depending arm 40, which is provided with a slot 41. A link 42 is pivotally connected at one end to the sleeve 34, while the other end of this'link is pivotally connected to a stud 43, which is adjustably mounted in the slot 41. The cross shaft 39 carries a second arm 44, on which is mounted a ball stud 45.

A second eccentric is mounted on the main shaft 14 and an eccentric strap 46 cooperates therewith. This eccentric strap 46 at its lower end is connected to the ball stud 45. As the main shaft rotates, the eccentric will impart endwise movement to the eccentric strap, and this in turn will oscillate the -cross shaft 39, which will move the sleeve 34 back and forth and thus impart endwise movement to the looper-supporting shaft. This endwise movement gives to the loopers their needle-avoiding movements.

The material is fed along the work-supporting. arm by a feed dog 47, carried by 0.

main feed bar 48. This main feed bar is raised and lowered by an-eccentric 49 on the looper-supporting shaft 24. The main feed bar is moved back and forth by a link 50, connected to an arm 51 mounted on the cross shaft 39. The feed bar adjacent its rear end is fulcrumed on a cross pin 51, which permits the feed bar to move endwise, and which causes the feed dog to be raised by the eccentric on the looper-supporting shaft. The feeding mechanism also includes a differentially operated feed dog which receives its endwise movements from the main feed bar and which is raised-and lowered with the main feed bar. This feeding mechanism forms no part of the present invention and further description thereof is not thought necessary.

From the above description, it will be noted that the link 42 which moves the loopers laterally has a slotted connection with the operating arm40 therefor, and by adjusting the stud 43 in the slot 41 in this arm the lateral throw given to the loopers may be varied.

It is obvious that minor changes in the details of construction and the arrangement of parts may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A sewing machine including in combination, a standard, an overhanging arm, a needle. bar mounted in said overhanging arm a needle carried thereby, a horizontal arm parallel with the overhanging arm and carried by said standard, .a main shaft. located in said horizontal arm, devices actuated by said main shaft for reciprocating the needle bar, a work-supporting arm carried by said horizontal arm, a looper located in said work-supporting arm and cocperating with said needle, and devices operated by said main shaft for imparting back and forth movements to said looper and lateral movements to said looper.

2. A sewing machine including in combination, a standard, an overhanging arm, a needle bar mounted in said overhanging arm, a needle carried thereby, a horizontal arm parallel with the overhanging arm and carried by said standard, a main shaft located in said horizontal arm, devices actuated by said main shaft for reciprocating the needle bar, a work-supporting arm carri'ed by said horizontal arm, a looper located in said work-supporting arm and cooperating with said needle, a looper-supporting shaft located in said work supporting arm, and devices actuated by said main shaft for oscillating said looper-supporting shaft and for moving the same endwise.

3. A sewing machine including in combination, a standard, an overhanging arm, a needle bar mounted in said overhanging arm, a needle carried thereby, a horizontal arm carried by said standard, a main shaft located in said'horizontal arm, devices actuated by said main shaft for reciprocating the needle bar, a work-supporting arm carried by said horizontal arm, a looper located in said work-supporting arm and cooperating with said needle, a shaft extend ing lengthwise of said work-supporting arm and carrying said looper, an eccentric on the main shaft, and devices actuated thereby for oscillating said looper-supporting shaft, a second eccentric on said main shaft, and devices operated thereby for moving said looper-supporting shaft back and forth.

4. A sewing machine including in combination, a standard, an overhanging arm, a needle bar mounted in said overhanging arm, a needle carried thereby, a horizontal arm carried by said standard, a main shaft located in said horizontal arm, devices actuated by said main shaft for reciprocating the needle bar, a work-supporting arm carried by said horizontal arm, a looper lo cated in said work-supporting arm and cooperating. with said needle, a looper-supporting shaft extending lengthwise of said Work-supporting arm, a sleeve freely mounted on said looper-supporting shaft and held from endwise movement thereon, an eccentric on the main shaft, devices operated therebyfor moving said sleeve endwise for giving an endwise movement to the looper-supporting shaft, a second eccentric on said main shaft, and devices operated thereby for oscillating said looper-supporting shaft.

5. A sewing machine including in combination, a standard, an overhanging arm, a needle bar mounted in said overhanging arm, a needle carried thereby, a horizontal arm carried by said standard, a main shaft located in said horizontal arm, devices actuted by said main shaft for reciprocating the needle bar, a work-supporting arm carried by said horizontal arm, a looper located in said worksupporting arm and cooperating with said needle, a looper-supporting shaft extending lengthwise of said work-supporting arm, a. sleeve freely mounted on said looper-supporting shaft and held from endvvise movement thereon, an eccentric on the main shaft, devices 0perated thereby for moving said sleeve endwise for giving an endwise movement to the looper-supporting shaft, a second eccentric on said main shaft, a cross shaft oscillated by said second eccentric, and means operated by said cross shaft for oscillating said looper-supporting shaft.

6. A sewing machine including in combination, a standard, a horizontal arm car ried by said standard, a depending post supported by said arm,

a work-supporting arm projecting laterally from the lower end of said depending post, a main shaft mounted in said horizontal arm, a looper mounted in the outer end of said work-supporting arm, a looper-supporting shaft carrying said looper and extending longitudinally of said work-supporting arm, a cross shaft mounted in said post. means for oscillating said cross shaft from said main shaft, means for oscillating said looper-supporting shaft from said cross shaft, :1 second cross shaft, means for oscillating said second cross shaft from said main shaft, and means oscillated by said second cross shaft for'moving the looper-supporting shaft endwise.

7. A sewing machine including in combination, a standard. a horizontal arm carried by said standard, a depending post supported by said arm, a work supporting arm projecting laterally from the lower end of said depending post, a main shaft mounted in said horizontal arm, a looper mounted in the outer end of said worksupporting arm. a looper-supporting shaft extending lengthwise of the work-supporting arm and carrying said looper, an arm fixed to said looper-supporting shaft at the rear end thereof. a cross shaft mounted in said post. an arm projecting from said cross shaft, :1 link connecting said arms, means for oscillating said cross shaft from said main shaft. and means for moving said looper-supporting shaft endwise.

8. A sewing machine including in combination. a standard, a horizontal arm carried by said standard. a depending post supported by said arm. a work-supporting arm projectinglaterally from the lower end of said (:lepcndipg post, a main shaft mounted in said horizontal arm. a looper mounted in the outer end of said work-supporting ar'm, a looper-supportiug shaft extending lengthwise of the worlesupporting arm and carryingsaid loopcr. an arm fixed to said looper-sup aorting shaft at the rear end thereof, a cross ha ft mounted in said post, an arm projecting from said cross shaft. a link connecting said arms. means for oscillating said cross shaft from said main shaft. 0. second cross shaft. a sleeve freely mounted on the loopcr-supporting shaft and held from endwise movement thereon, adjustable means operated by said second cross shaft for moving the sleeve endwise, and means operated by the main shaft for oscillating said second cross shaft.

9. A sewing machine including in combination. a standard, an overhanging arm, a needle bar mounted in said overhanging arm. needles carried bv said needle bar. a horizontal arm parallel with the overhang ing arm and carried by said standard. a main shaft located in said horizontal arm,

a work supporting arm extending in a direction at an angle to the horizontal arm, a looper located in said work supporting arm and cooperating with the needles, a looper szontal arm, and means operated from said \10 mam shaft in said horlzontal arm for moving said looper laterally, said means ineluding devices whereby the lateral throw of the looper may be varied.

In testimony whereof I afiix my signature in the presence of two witnesses.

S. GEORGE TATE, JAMES B. MOFFATT. 

